SỰ KHUẾCH TÁN TRONG CÁC KIM LOẠI Au, Cu VÀ CÁC HỢP KIM XEN KẼ AuSi, CuSi

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Tác giả: Lan Hương Lê, Đức Hiền Nguyễn, Ngọc Lê Nguyễn, Quang Học Nguyễn, Thị Hòa Nguyễn

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học - Trường Đại học Sư phạm Hà Nội: Khoa học Tự nhiên, 2023

Mô tả vật lý: tr.27

Bộ sưu tập: Metadata

ID: 342098

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Bài báo thực hiện tính số đối với thể tích kích hoạt, năng lượng kích hoạt, hệ số trước hàm mũ và hệ số khuếch tán đối với các kim loại Au, Cu và các hợp kim xen kẽ AuSi, CuSi trong khoảng nồng độ nguyên tử xen kẽ từ 0 đến 4%, trong khoảng nhiệt độ từ 700 đến 1873 K, trong khoảng áp suất từ 0 đến 180 GPa và trong khoảng độ biến dạng từ 0 đến 5%. Bài báo xác định sự phụ thuộc của hệ số khuếch tán vào áp suất và độ biến dạng đối với các kim loại và hợp kim nói trên. Kết quả tính số bằng SMM đã chứng tỏ rằng định luật Arrhenius được nghiệm đúng đối với kim loại và hợp kim xen kẽ tại các áp suất và nồng độ nguyên tử xen kẽ khác nhau. Các kết quả tính số bằng phương pháp thống kê mômen (SMM) đối với Au ở T = 1000 K và T = 1250 K và áp suất không phù hợp tốt với thực nghiệm đối với năng lượng kích hoạt (sai số dưới 10%) và phù hợp về bậc độ lớn đối với hệ số trước hàm mũ và hệ số khuếch tán. Các kết quả tính số hệ số khuếch tán bằng SMM đối với Au trong khoảng từ 977 đến 1321 K và đối với Cu trong khoảng từ 933,95 đến 1336,15 K được so sánh với với thực nghiệm và tính toán khác và cho sự phù hợp khá tốt về bậc độ lớn. Các kết quả tính số thể tích kích hoạt bằng SMM đối với Au và Cu phù hợp tốt với các tính toán khác. Các kết quả tính số bằng SMM đối với các đại lượng khuếch tán của các hợp kim xen kẽ AuSi, CuSi ở các nhiệt độ, áp suất, ứng suất và nồng độ nguyên tử xen kẽ khác nhau có tính dự báo, định hướng cho các thực nghiệm trong tương lai.The paper performs numerically the vacancy activation volume, the activation energy, the pre-exponential factor, and the diffusion coefficient for metals Au, Cu, and alloys AuSi, CuSi in the interval of the concentration of interstitial atoms from zero to 4%, in the interval of temperature from 700 to 1873 K, in the interval of pressure from zero to 180 GPa and the interval of strain from zero to 5%. The paper determines the dependence of the diffusion coefficient on pressure and stress for above mentioned metals and alloys. SMM numerical results show that the Arrhenius law is satisfied for metals and interstitial alloys at different pressures and concentrations of interstitial atoms. SMM numerical results for Au at T = 1000 K and T = 1250 K and at zero pressure are in good agreement with experiments for the activation energy (errors are below 10%) and agree in terms of magnitude for the pre-exponential factor and the diffusion coefficient. SMM numerical results of the diffusion coefficient for Au in the interval of temperature from 977 to 1321 K and for Cu in the interval of temperature from 933.95 to 1336.15 K are compared with experiments and other calculations and there are rather good agreement in terms of magnitude. SMM numerical results of the activation volume of Au and Cu agree well with other calculations. SMM numerical results for diffusion quantities of interstitial alloys AuSi, CuSi in different temperatures, pressures, stresses, and concentrations of interstitial atoms anticipate and orient experiments in the future.

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